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“Cleared for (type of) approach” (air traffic control). ATC authorization for an aircraft to execute a
specific instrument approach to an airport.
“Cleared for approach” (air traffic control). ATC authorization for an aircraft to execute any standard or
special instrument approach for that airport.
“Cleared for takeoff” (air traffic control). ATC authorization for an aircraft to depart. This clearance is
based on known traffic and known physical airport conditions.
“Cleared for the option” (air traffic control). ATC authorization for an aircraft to make a touch-and-go,
low approach, missed approach, stop-and-go, or full-stop landing at the discretion of the pilot.
This clearance is normally used in flight training, to allow the instructor to evaluate the student’s
performance under changing situations.
“Cleared through” (air traffic control). ATC authorization for an aircraft to make intermediate stops at
specified airports without refiling a flight plan while en route to the clearance limit.
“Cleared to land” (air traffic control). ATC authorization for an aircraft to land. This clearance is based
on known traffic and known physical airport conditions.
clear ice (meteorology). Transparent ice that forms on an aircraft in smooth layers when the aircraft is
flying through freezing rain or supercooled clouds. Clear ice, also called glaze ice, forms fastest when the
drops of water are large, such as those found in cumuloform clouds.
clearing an engine (gas turbine engine operation). The act of clearing combustible gases from the inside
of a gas turbine engine after an aborted start.
The engine is rotated with the starter so the compressor can force fresh air through the engine and
carry all the dangerous vapors out the tail pipe.
clearway. 14 CFR Part 1:
“(1) For turbine engine powered airplanes certificated after August 29, 1959, an area beyond the
runway, not less than 500 feet wide, centrally located about the extended centerline of the runway, and
under the control of the airport authorities. The clearway is expressed in terms of a clearway plane,
extending from the end of the runway with an upward slope not exceeding 1.25 percent, above which no
object nor any terrain protrudes. However, threshold lights may protrude above the plane if their height
above the end of the runway is 26 inches or less and they are located to each side of the runway.
(2) For turbine engine powered airplanes certificated after September 30, 1958, but before August
30, 1959, an area beyond the takeoff runway extending no less than 300 feet on either side of the extended
centerline of the runway, at an elevation no higher than the elevation of the end of the runway, clear of all
fixed obstacles, and under the control of the airport authorities.”
Cleco fastener. A patented spring-type fastener used to hold metal sheets until they can be permanently
riveted together. A special pair of Cleco pliers pulls the spreader from between the jaws of a Cleco fastener
so the jaws will pull together enough for them to pass through the rivet holes drilled in the metal.
When the fastener is installed, the pliers release the spreader, which forces the jaws out against the
metal and pulls the sheets tightly together.
clevis. A U-shaped fitting which has matching holes in the arms of the U. A clevis pin or clevis bolt is
passed through the holes to fasten a control cable to a control horn or to fasten a push-pull rod to a bell
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 130
crank.
clevis bolt. A special bolt used to attach a clevis to a control horn or bell crank so the clevis is free to move.
Clevis bolts have a short threaded section separated from the shank of the bolt by a shallow groove. The
head of a clevis bolt is slotted so it can be turned with a screwdriver, but the slot is so shallow very little
torque can be applied.
A thin nut is used on a clevis bolt, and this nut should not be tightened enough to keep the clevis
from moving freely on the device to which it is connected.
clevis pin. A flathead pin used to attach a clevis to a control horn. The clevis pin is inserted through the
holes in the clevis and the control horn, a washer is placed on the shank of the clevis pin, and the clevis pin
is secured with a cotter pin passed through the hole in its shank.
climate (meteorology). The meteorological conditions, including temperature, precipitation, and wind that
characteristically prevail in a region or area.
climatology (meteorology). The study of climate.
climbing blade (helicopter operation). The blade of a helicopter rotor that is in track when checked on the
　
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